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x in (-oo:+oo)
y = (3/4)*x // - (3/4)*x
y-((3/4)*x) = 0
(-3/4)*x+y = 0
y-3/4*x = 0 // - y
-3/4*x = -y // : -3/4
x = -y/(-3/4)
x = 4/3*y
x = 4/3*y
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